US9057137B2 - Method and device for carboxylic acid production - Google Patents

Method and device for carboxylic acid production Download PDF

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US9057137B2
US9057137B2 US13/103,716 US201113103716A US9057137B2 US 9057137 B2 US9057137 B2 US 9057137B2 US 201113103716 A US201113103716 A US 201113103716A US 9057137 B2 US9057137 B2 US 9057137B2
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carboxylic acid
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anolyte
electrolysis cell
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US20120031769A1 (en
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Sai Bhavaraju
Kean Duffey
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Enlighten Innovations Inc
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Ceramatec Inc
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B13/00—Diaphragms; Spacing elements
    • C25B13/04—Diaphragms; Spacing elements characterised by the material
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/02—Hydrogen or oxygen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/42—Electrodialysis; Electro-osmosis ; Electro-ultrafiltration; Membrane capacitive deionization
    • B01D61/422—Electrodialysis
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B15/00—Operating or servicing cells
    • C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B3/00—Electrolytic production of organic compounds
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B3/00—Electrolytic production of organic compounds
    • C25B3/20—Processes
    • C25B3/23—Oxidation

Definitions

  • the present disclosure relates to a method of forming lactic acid (or other carboxylic acids) using an electrolysis cell. More specifically, the present disclosure relates to forming lactic acid (or other carboxylic acids) using an electrolysis cell without having the cell's solid ion conducting membrane (e.g., NaSICON membrane) be fouled (poisoned) by the formed acid.
  • solid ion conducting membrane e.g., NaSICON membrane
  • Lactic acid is a common chemical encountered in foodstuffs, medicines and other products. Lactic acid is a naturally occurring chemical and has the formula CH 3 CH(OH)COOH. The corresponding lactate anion has the formula CH 3 CH(OH)COO ⁇ However, for convenience, lactic acid and the lactate anion are often represented by their stoichiometric formulas, namely C 3 H 6 O 3 and C 3 H 5 O 3 ⁇ .
  • Lactic acid is a desirable product because it may be converted into a biodegradable polymer that may be used to form bottles and other useful products. Accordingly, the market for lactic acid is continuously growing. There are known ways to make lactic acid, including using gypsum as a reactant.
  • a solid ion conducting membrane such as a NaSICON membrane
  • Na + sodium ions
  • lactic acid is an organic acid
  • the lactic acid produced in this reaction would decrease the pH of the anolyte solution. This decrease in the pH operates to stop the conduction of the sodium ions through the membrane. This is referred to as “poisoning” or “fouling” of the membrane.
  • the present embodiments address the acidic poisoning of a membrane (such as a NaSICON membrane) in an electrolysis cell by using a two phase electrolysis approach.
  • the present embodiments use a mixture of aqueous (or more polar) and non-aqueous (or less polar) solvents in the anolyte.
  • the lactic acid (or another carboxylic acid) that is produced in the anolyte is removed into the non-aqueous (organic) second phase.
  • the second phase (organic phase) therefore preferentially absorbs the lactic acid from the aqueous phase, leaving sodium lactate anions in the aqueous phase. This phenomenon is called partitioning.
  • sodium lactate which is more polar than lactic acid, prefers the polar solvent (water) while lactic acid, which is less polar, prefers a less polar or non-polar (organic) solvent.
  • the lactic acid that migrates into the non-aqueous (non-polar) phase will not dissociate to form H + ions.
  • the pH of the anolyte in the aqueous phase is generally governed by the presence of the lactate anion (which is a basic entity). The pH of the anolyte thus does not substantially drop upon the formation of the lactic acid and as such, the lactic acid will not poison the NaSICON membrane. Rather, the cell operates at the basic (or perhaps neutral) pH and the membrane conducts the sodium ions into the catholyte until all the sodium lactate is consumed.
  • FIG. 1 shows a flow diagram of a method of producing carboxylic acids (and other products) from biomass
  • FIG. 2 shows a schematic diagram of a multi-compartment electrolysis cell according to the present embodiments
  • FIG. 3 shows a schematic diagram of another embodiment of a multi-compartment electrolysis cell
  • FIG. 4 shows a flow diagram of a method of producing carboxylic acids and other products using the present embodiments
  • FIG. 5 is a flow diagram of another embodiment of a method of producing carboxylic acids and other products.
  • FIG. 6 shows a schematic diagram of a computer-simulated method for separating a carboxylic acid from an anolyte mixture.
  • an overall process 100 is shown for producing a carboxylic acid.
  • the process 100 produces a carboxylic acid in an electrolysis cell 104 .
  • the electrolysis cell 104 has an ion conducting membrane.
  • the process 100 begins by obtaining the corresponding anion for the carboxylic acid. In some embodiments, this anion may be obtained from a quantity of biomass 102 . Obviously, given its abundance in nature, it is desirable to find a way to use this biomass as a starting material to form a useable carboxylic acid product.
  • biomass 102 may comprise, for example, carbohydrates, lipids (such as fats or oils), lignins, tall oil and/or resins from plant, algal, or animal origin.
  • lipids such as fats or oils
  • lignins such as tall oil and/or resins from plant, algal, or animal origin.
  • Other examples of biomass include wood chips, forestry residue, energy crops (switch grass, miscanthus, sorghum, energy cane and other genetically modified plants), algae, cyanobacteria, jatropha, soy bean, corn, palm, coconut, canola, rapeseed, Chinese tallow, animal fats products of genetically modified organisms, and the like.
  • the biomass 102 may be from algal, animal, microbial, or plant origins (such as wood, etc.). In one embodiment, any type of biomass may be used, whether the source of this biomass 102 is natural, synthetic, man-made, or even genetically altered (such as in the case of microbes, microorganisms, or animals). If the biomass is from an algal material, the algae may be synthesized, genetically-altered, or may be naturally occurring. Mixtures of different types of biomass may also be used. As explained in detail herein, the biomass 102 may be used as a starting material to ultimately arrive at a carboxylic acid (such as, for example, lactic acid).
  • a carboxylic acid such as, for example, lactic acid
  • the quantity of the biomass 102 may be obtained.
  • This biomass 102 may be converted 110 into an alkali salt of a carboxylic acid 112 (which may be also referred to as a “carboxylate”).
  • Other products 114 may also be formed.
  • this conversion 110 of the biomass 102 may involve an alkaline fermentation reaction and may occur at an alkaline fermentation refinery 106 or at another similar facility.
  • Other processing steps either in addition to or in lieu of the fermentation reaction (e.g. hydrolysis of biomass in alkaline media), may also be used to produce the carboxylate 112 .
  • the alkali salt of a carboxylic acid 112 will be a sodium salt.
  • the alkali salt of a carboxylic acid 112 and/or the other products 114 may optionally be subjected to a water removal step 120 and/or other processing.
  • a water removal step 120 and/or other processing may optionally be subjected to a water removal step 120 and/or other processing.
  • the alkali salt of a carboxylic acid 112 may be added 105 to the electrolysis cell 104 (having the ion conducting membrane.)
  • the process 109 that is used by the cell 104 is described herein in greater detail. This process 109 forms a carboxylic acid 130 as well as other usable products 132 .
  • the carboxylic acid 130 and the other products 132 may then undergo a purification step 140 to produce a concentrated supply of the carboxylic acid 144 , other byproducts 146 and a concentrated supply of caustic 150 (such as NaOH).
  • the electrolysis cell 104 may be a multi-compartment electrolysis cell 104 that uses an organic phase to separate the formed carboxylic acid from an aqueous phase.
  • the electrolysis cell 104 may be used to convert biomass to a carboxylic acid.
  • the electrolysis cell 104 may be a multi-compartment electrolysis cell. Accordingly the cell 104 may comprise two separate compartments, namely a cathodic compartment 204 and an anodic compartment 206 .
  • the cathodic compartment 204 may be in communication with a cathode 210 .
  • the cathode 210 may be wholly located within the cathodic compartment 204 . In other embodiments, at least part of the cathode 210 is not located within the cathodic compartment 204 .
  • the anodic compartment 206 may be in communication with an anode 212 .
  • the anode 212 may be wholly located within the anodic compartment 206 . In other embodiments, at least part of the anode 212 is not located within the anodic compartment 206 .
  • Those skilled in the art will appreciate how to construct the cathode 210 , the anode 212 , the cathodic compartment 204 and/or the anodic compartment 206 so that an electrolysis (electrolytic) reaction may occur within the electrolysis cell 104 .
  • a power source 218 is in communication with the anode 212 and the cathode 210 and operates to create a current between the cathode 210 and the anode 212 (e.g., an applied current within the cell 104 to generate current or vice-versa).
  • the electrolysis cell 104 may further comprise a solid alkali ion transporting membrane 220 .
  • the solid alkali ion transporting membrane 220 may separate the anodic compartment 206 from the cathodic compartment 204 .
  • the solid alkali ion transporting membrane 220 may be capable of transporting alkali metal ions from the anodic compartment 206 to the cathodic compartment 204 .
  • the membrane 220 may be a NaSICON membrane.
  • NaSICON is a material known in the art and may be used to form the membrane. Some NaSICON membranes are commercially available from Ceramatec, Inc., of Salt Lake City, Utah.
  • NaSICON typically has a relatively high ionic conductivity for sodium ions at room temperature.
  • the alkali metal is lithium
  • a particularly well suited material that may be used to construct an embodiment of the membrane is LiSICON.
  • the alkali metal is potassium
  • a particularly well suited material that may be used to construct an embodiment of the membrane is KSICON.
  • solid electrolyte membranes include those membranes based on the NaSICON structure, sodium conducting glasses, beta alumina and solid polymeric sodium ion conductors. Such materials are commercially available.
  • such membranes are tolerant of impurities that may be in the anolyte and will not allow the impurities to mix with the catholyte.
  • the impurities (which may be derived from the biomass) do not necessarily have to be removed prior to placing the anolyte in the cell 104 .
  • such membranes may also be desirable because they are not subject to degradation by polymers, as is possible with other types of polymer membranes.
  • the electrolysis cell 104 may comprise an anolyte 230 and a catholyte 226 .
  • the catholyte 226 may comprise an aqueous solution.
  • the catholyte 226 may be housed, at least partially, within the cathodic compartment 204 .
  • the anolyte 230 may be housed, at least partially, within the anodic compartment 206 .
  • the anolyte 230 comprises a first solvent 234 and a second solvent 232 .
  • the two solvents 232 , 234 are generally immiscible or partially immiscible such that they separate out from each other.
  • the types of solvents that may be used comprise water and an organic solvent (such as, for example, hexanol cyclohexanol, octonal, or butanol). Of course, other types of organic solvents may also be used.
  • the first solvent 234 may comprise water (or an aqueous phase) whereas the second solvent 232 may comprise an organic solvent.
  • the anolyte 230 may also comprise a quantity of an alkali salt of a carboxylic acid 224 (which, as noted above, may be derived from biomass).
  • the alkali metal is sodium and the alkali salt of a carboxylic acid 224 is sodium lactate:
  • This liquid-liquid extraction reduces pH effects on the anolyte 230 (caused by the formation of the acid 228 ) and protects the NaSICON membrane. More specifically, when the lactic acid 228 partitions into the second solvent 232 , the lactic acid 228 does not dissociate into H + ions and lactate anions. Rather, the lactic acid remains in its neutral (molecular) form in the organic phase. Further, when the lactic acid 228 partitions into the second solvent 232 , the alkali salt of a carboxylic acid 224 (e.g., sodium lactate) is left in the first solvent 234 (e.g., the water or aqueous phase).
  • a carboxylic acid 224 e.g., sodium lactate
  • the alkali salt of a carboxylic acid 224 is a basic chemical, and as such, the pH of the anolyte 230 does not drop to an acidic level upon the formation of the acid 228 .
  • NaSICON membranes have been known to foul or be poisoned in an acidic pH, such as, for example, a pH of 6 or lower.
  • an acidic pH such as, for example, a pH of 6 or lower.
  • the anolyte 230 does not achieve an acidic pH and the NaSICON membrane 220 is not fouled.
  • the carboxylic acid 228 may be extracted and isolated. This separation may occur by removing the anolyte 230 from the cell 104 (after it has been electrolyzed). (Alternatively, the separation of the first solvent 234 and the second solvent 232 may occur within the cell 104 .) Once removed, the water and organic phases may be easily separated via known techniques. The carboxylic acid 228 may then be recovered (separated) from the organic second solvent 232 , thereby achieving a supply of the desired carboxylic acid 228 .
  • the anolyte 230 that was removed from the cell 104 may be returned (re-fed) into the cell 104 so that the cell 104 may be reused.
  • the second solvent devoid of carboxylic acid product, is recombined with the first solvent to remake the anolyte 230 that may be returned (re-fed) into the cell 104 so that the cell 104 may be reused.
  • the separation process(es) used to separate the water and the organic solvent may be implemented as a continuous process, wherein sodium carboxylate is continuously being added to the anolyte and/or first solvent and the anolyte is re-fed into the cell 104 and carboxylic acid is continuously recovered.
  • sodium ions (Na + ) are produced. These sodium ions (Na + ) may be transported across the NaSICON membrane 220 and enter the catholyte 226 . Once in the catholyte 226 , the sodium ions (Na + ) may react with hydroxide ions (OH ⁇ ) (which were formed during water (H 2 O) reduction on the cathode 210 ) to form pure caustic (NaOH). Hydrogen gas (H 2 ) may also be formed in the cathodic compartment 204 .
  • FIG. 3 another exemplary embodiment of an electrolysis cell 104 a is illustrated.
  • the electrolysis cell 104 a that is shown in FIG. 3 is similar to that which was shown in FIG. 2 and may be used in the process 100 of FIG. 1 . Accordingly, for purposes of brevity, much of the discussion of the features/elements of FIG. 3 that are similar to that which was found in FIGS. 1 and 2 will be omitted.
  • electrolysis cell 104 a is a multi-compartment electrolysis cell. However, unlike the two-compartment cell (having a cathodic compartment and an anodic compartment) shown in FIG. 2 , the electrolysis cell 104 a of FIG. 3 is a three-compartment cell. Specifically, the electrolysis cell 104 a comprises a cathodic compartment 204 , an anodic compartment 206 as well as a middle compartment 310 . The middle compartment 310 may be interposed between the cathodic compartment 204 and the anodic compartment 206 .
  • the middle compartment 310 may be separated from the cathodic compartment 204 by the solid alkali ion transporting membrane 220 (such as, for example, the NaSICON membrane).
  • the middle compartment 310 may be separated from the anodic compartment 206 by an anionic membrane 312 .
  • An anionic membrane 312 may allow anions to pass through (e.g., exit the middle compartment 310 and enter the anodic compartment 206 ), but will prevent cations from passing through the anionic membrane 312 .
  • the electrolysis cell 104 a of FIG. 3 may operate to form a carboxylic acid 228 .
  • An example of how the cell 104 a may be used to create a carboxylic acid 228 will now be provided in which the alkali metal is sodium and the alkali salt of the carboxylic acid is sodium lactate (C 3 H 5 O 3 Na).
  • an inlet stream 340 enters the middle compartment 310 .
  • the introduction of this stream 340 means that there may be a liquid 301 in the middle compartment 310 .
  • This liquid 301 may contain the alkali salt of a carboxylic acid (e.g., sodium lactate).
  • the lactate anions (C 3 H 5 O 3 ⁇ ) 224 move (under the influence of the applied voltage supplied by the voltage source 218 ) from the middle compartment 310 through an anionic membrane 312 into the anodic compartment 206 .
  • the positively charged sodium ions (Na + ) are not allowed to pass through the anionic membrane 312 . Instead, sodium ions (Na + ) move from the middle compartment 310 through the cationic NaSICON membrane 220 into the cathodic compartment 204 .
  • the chemical reactions of the anolyte 230 within the anodic compartment 206 as well as the chemical reactions of the catholyte 226 within the cathodic compartment 204 operate identically to the process described in FIG. 2 .
  • the sodium ions (Na + ) move through the NaSICON membrane 220 into the cathodic compartment 204 , these cations enter the catholyte 226 .
  • the sodium ions (Na + ) may react with hydroxide ions (OH ⁇ ) (which were formed during water (H 2 O) reduction on the cathode 210 ) to form pure caustic (NaOH).
  • Hydrogen gas (H 2 ) may also be formed in the cathodic compartment 204 .
  • the lactic acid (C 3 H 6 O 3 ) 228 is partitioned into the second solvent 232 (organic phase) of the anolyte 230 based on its solubility preference for this phase. While the lactic acid 228 partitions into the second solvent 232 , the lactate 224 anion partitions into the first solvent 234 (e.g., the water or aqueous phase).
  • the lactate anion 224 is a basic chemical, and as such, the pH of the anolyte 230 does not drop upon the formation of the acid 228 .
  • the lactic acid in the second solvent 232 does not dissociate and form H + and thus, the pH in the anodic compartment remains basic (or neutral) and above a pH of about 6.
  • the NaSICON membrane e.g., another compartment
  • the pH of the liquid 301 in the middle compartment 310 e.g., around the NaSICON membrane
  • the basic lactate anion Accordingly, the NaSICON membrane 220 in the cell 104 a is not fouled.
  • FIGS. 4 and 5 represent two different Process Flow Diagrams (PFD) that show continuous processes of how embodiments may be constructed and used to produce lactic acid/carboxylic acids. Both FIG. 4 and FIG. 5 show continuous processes, although both concepts could also be demonstrated using batch processes.
  • FIGS. 4 and 5 show a possible process flow scheme in which the acid generated is separated from the water phase (e.g., the first solvent) external of the cell (e.g., in a separate liquid-liquid separation tank). However, embodiments could also be made in which no liquid-liquid separation tank is used in which the separation of the water from the organic phase occurs within the cell itself. It should be noted that the process shown in FIG.
  • the approach shown in FIG. 5 also has its advantages in that it does not require a well-mixed solution to enter the cell and thus could possibly require less solvent (although it may indeed require higher cell throughput).
  • Each PFD shown in FIGS. 4 and 5 is designed to provide control over the water/solvent ratio for a liquid-liquid extraction that occurs either inside or outside of the electrolytic cell.
  • the ratio of water to solvent should be tailored to the specific process and solvent being used, thereby achieving maximum acid removal with minimal solvent. Theoretically, the water is only required in the process to (1) keep all sodium lactate and other inlet stream constituents dissolved and (2) provide protons (W) for the production of the acid. Thus, excess water in the anolyte may be avoided. In fact, from a practical standpoint, water removal from a post-fermentation stream may be beneficial prior to the stream entering the electrolytic process (as indicated by the water removal step 120 in FIG. 1 ).
  • an inlet broth 401 may be obtained. (As explained herein, this broth 401 may be derived from biomass.) The broth 401 may be added to a mixing tank 403 . The inlet broth 401 may comprise the products generated by the conversion reaction 110 (for example, the fermentation reaction) of FIG. 1 . A pump 405 and/or one or more valves 407 (as needed) may be used to introduce the inlet broth 401 from the mixing tank 403 into the electrolysis cell 104 (or 104 a ).
  • an electrolysis cell 104 / 104 a may be used to produce a carboxylic acid.
  • the catholyte 226 (not shown in FIG. 4 ) may be used to produce concentrated caustic (e.g., NaOH).
  • a solution 404 of the catholyte 226 may be extracted from the cell 104 / 104 a . This solution may then be subjected to a heat exchange/temperature exchange 408 (that may be powered by one or more utilities 410 ).
  • One or more valves 412 may be used to introduce the coolant chemicals that may be needed in the heat exchange/temperature exchange.
  • Those skilled in the art will appreciate the processes/conditions necessary to accomplish this heat exchange/temperature exchange 408 .
  • hydrogen gas 420 may be extracted.
  • hydrogen gas (H 2 ) was produced in the cathodic compartment 204 (not shown in FIG. 4 ), and thus, this gas 420 may be collected so that it may be sold, disposed of, re-used, etc.). Also, because water is consumed as part of the reaction in the catholyte 226 , the water in the catholyte 226 may become depleted.
  • water 424 may be added to the tank 416 , as needed.
  • caustic (NaOH) 428 is produced in the catholyte 226 , and as such, a quantity (such as a concentrated quantity) of NaOH 428 may be removed from the tank 416 , as needed.
  • This caustic 428 may be sold, disposed of, re-used, etc.).
  • caustic NaOH may be used in the conversion reaction 110 of FIG. 1 . Accordingly, this produced caustic 428 may then be recycled and reused in that conversion reaction 110 , thus lowering the overall costs associated with the present embodiments.
  • the catholyte 226 that is found in the catholyte recirculation tank 416 may be returned (re-fed) back 430 into the cell 104 / 104 a , thus replenishing the supply of catholyte in the cell 104 / 104 a .
  • a pump 432 and/or a valve 431 ) may be used to push the replenished catholyte from the tank 416 into the cell 104 / 104 a .
  • This processing of the catholyte 226 that was described above may be referred to as the “caustic loop” 434 of the overall process 400 .
  • This caustic loop 434 operates to replenish and renew the catholyte 226 in the cell 104 / 104 a so that the overall process may be operated continuously. Thus, a fresh, updated supply of the catholyte 226 may continuously be present in the cell 104 / 104 a.
  • the process 400 also may include a solvent loop 440 that may be used to extract the produced carboxylic acid from the anolyte 230 (not shown in FIG. 4 ) and/or replenish/update the anolyte 230 .
  • the anolyte 230 in the anodic compartment 206 may comprise a first solvent 234 (not shown in FIG. 4 ) and a second solvent 232 (not shown in FIG. 4 ).
  • the first solvent 234 may be water and the second solvent 232 may be an organic solvent).
  • the alkali salt of the carboxylic acid 224 (not shown in FIG.
  • the anolyte 230 may be extracted 441 from the cell 104 / 104 a and added to a liquid-liquid separation tank 442 .
  • the separation tank 442 contains a first solvent (water phase) 495 and a second solvent (organic solvent) 497 .
  • the second solvent (organic phase) 497 contains the formed carboxylic acid 228 and is separated 445 from the water 495 (first solvent).
  • This separated second solvent 497 may, as needed, be subjected to a heat exchange/temperature exchange reaction 447 (that may be powered by one or more utilities 449 such as steam).
  • a heat exchange/temperature exchange reaction 447 that may be powered by one or more utilities 449 such as steam.
  • One or more valves 452 may be used to introduce the chemicals that may be needed in the heat exchange/temperature exchange process 447 .
  • the utility such as steam
  • the utility may be collected and reused 451 after this heat exchange/temperature exchange 447 has occurred.
  • a distillation may be performed upon the second solvent 497 .
  • This distillation (or other separation process) may occur within a distillation column 455 .
  • the distillation column 455 separates out the various components from the second solvent 497 .
  • the carboxylic acid 457 such as lactic acid
  • Any water 461 that may have been present in the second solvent 497 may also be removed and re-used, treated, disposed of, etc.
  • any oxygen gas 459 (which was produced in the anolyte reaction) may also be removed from the tank 442 and collected, disposed of, sold, used, etc.
  • the second solvent 497 may leave 469 the distillation column 455 .
  • the second solvent 497 may then be combined with anolyte 230 that has been extracted from the liquid-liquid separation tank 416 .
  • a portion of the water phase 495 and the organic phase 497 may be extracted from the separation tank 442 and combined 493 together.
  • This combined flow may then be added to the flow 469 after it leaves the distillation column 455 .
  • the process in FIG. 4 shows an embodiment, where a two-phase liquid solution is introduced into the electrolytic cell, providing for some partitioning of the solution within the cell, and therefore possible pH buffering within the cell.
  • This combined liquid may then be filtered 473 , as desired, to remove contaminants 474 .
  • this combined liquid may then be subjected to a heat exchange/temperature exchange process 478 (that may be powered by one or more utilities 480 ).
  • One or more valves 482 may be used to introduce chemicals that may be needed in the heat exchange/temperature exchange.
  • the products of this heat exchange/temperature exchange 478 may be then added 491 to the mixing tank 403 for use, and may ultimately be reused, in the cell 104 / 104 a.
  • the process 400 represents a continuous process where the products are continuously being produced and removed from the system.
  • a fresh, update supply of the anolyte 230 may continuously be present in the cell 104 / 104 a .
  • This process 400 also provides an external liquid-liquid extraction process using the tank 442 .
  • an inlet broth 501 may be obtained and be added to an anolyte recirculation tank 503 .
  • the inlet broth 501 may comprise the products generated by the conversion reaction 110 (such as, for example, a fermentation reaction) of FIG. 1 .
  • a pump 505 and/or one or more valves 507 may be used to introduce the inlet broth 501 from the mixing tank 503 into the electrolysis cell 104 (or 104 a ).
  • caustic loop 434 of the process 500 (which is associated with the catholyte) operates in the same manner as the caustic loop 434 of FIG. 4 . Accordingly, for purposes of brevity, a discussion of the caustic loop 434 will not be repeated.
  • the process 500 also may include a solvent loop 540 that may be used to extract the produced carboxylic acid from the anolyte 230 (not shown in FIG. 5 ).
  • the anolyte 230 in the anodic compartment 206 may comprise a first solvent 234 (not shown in FIG. 5 ) and a second solvent 232 (not shown in FIG. 5 ).
  • the first solvent 234 may be water and the second solvent 232 may be an organic solvent).
  • the alkali salt of the carboxylic acid 224 (not shown in FIG. 5 ) is preferentially present in the first solvent 234 and the formed carboxylic acid 228 (not shown in FIG.
  • the anolyte 230 may be extracted 441 from the cell 104 / 104 a and added to a liquid-liquid separation tank 442 .
  • the separation tank 442 contains a first solvent (water phase) 495 and a second solvent (organic solvent) 497 .
  • the second solvent (organic phase) 497 contains the formed carboxylic acid 228 and is separated 445 from the water 495 (first solvent).
  • This separated second solvent 497 may, as needed, be subjected to a heat exchange/temperature exchange 447 (that may be powered by one or more utilities 449 such as steam).
  • a heat exchange/temperature exchange 447 that may be powered by one or more utilities 449 such as steam.
  • One or more valves 452 may be used to introduce chemicals that may be needed in the heat exchange/temperature exchange 447 .
  • the utility such as steam
  • the utility may be recollected and reused 451 after this heat exchange/temperature exchange 447 has occurred.
  • a distillation reaction may occur upon the second solvent 497 .
  • This distillation process (or other separation process) may occur within a distillation column 455 .
  • the distillation column 455 separates out the various components from the second solvent 497 .
  • the carboxylic acid 457 such as lactic acid
  • Any water 461 that may have been present in the second solvent 497 may also be removed and re-used, treated, disposed of, etc.
  • any oxygen gas 459 (which was produced in the anolyte reaction) may also be removed from the tank 442 and collected, disposed of, sold, used, etc.
  • the solvent 497 from the distillation column 455 may be extracted 571 and be returned 572 to the liquid-liquid separation tank 442 , where it may re-mix with the other anolyte 230 and be reused.
  • the process 500 may also include a water loop 570 .
  • the water loop 570 begins when a portion of the water phase 495 (e.g., the first solvent) is removed 581 from the liquid-liquid separation tank 442 . This removed liquid may then be filtered 583 to remove contaminants 585 .
  • the water phase 495 may then be subjected to a heat exchange/temperature exchange 578 (that may be powered by one or more utilities 580 ).
  • One or more valves 582 may be used to introduce chemicals that may be needed in the heat exchange/temperature exchange.
  • the products of this heat exchange/temperature exchange 578 are then added 591 to the tank 503 so that they may ultimately be reused in the cell 104 / 104 a .
  • only the water phase is introduced into the cell, thus simplifying the process, but risking a lower pH within the cell. In such an embodiment, higher flow rates through the cell may be utilized to manage this risk.
  • the process 500 represents a continuous process where the products are continuously being produced and removed from the system.
  • a fresh, updated supply of the anolyte 230 and catholyte 226 may continuously be present in the cell 104 / 104 a .
  • This process 500 provides an external liquid-liquid extraction process using the tank 442 .
  • This computer-simulated process 600 involves separating out a carboxylic acid from a mixture of water and an organic solvent (which may be, for example hexanol, cyclohexanol, octonal, and butanol or other solvents). Specifically, an anolyte mixture of two different solvents is simulated. This mixture comprises a solution 602 of 20% lactic acid/80% water and a solution of hexanol 604 . The solutions 602 , 604 are mixed in a liquid-liquid extractor 606 . In the simulation of FIG. 6 , 4.5 L of the hexanol 604 is mixed with every 1 L of the water solution 602 . Thus, there is substantially more hexanol in the simulated mixture than there is water.
  • an organic solvent which may be, for example hexanol, cyclohexanol, octonal, and butanol or other solvents.
  • an anolyte mixture of two different solvents is
  • the liquid-liquid extractor 606 is able to separate the water from the hexanol and the lactic acid. Specifically, water may be extracted 610 from the extractor 606 . According to the simulation, the water 611 will be about 99% (with the remainder being hexanol and lactic acid). Likewise, a mixture of hexanol and lactic acid may also be extracted 612 from the liquid-liquid extractor 606 .
  • the mixture 601 of hexanol/lactic acid which may or may not contain a minor fraction of water, may then be subjected to a distillation column 616 .
  • This distillation column 616 operates to separate the lactic acid from the hexanol. Specifically, the lactic acid is extracted 620 from the column 616 (and subjected to a heat exchange/temperature exchange process or other purification process 630 as needed).
  • the simulation indicates that the quantity of lactic acid 636 that may be obtained from such processes is over 99% pure.
  • the hexanol may be extracted 640 from the column 616 (and may be subjected to a heat exchange/temperature exchange process or other purification reaction 650 ) as needed).
  • the simulation indicates that the quantity of hexanol 646 that that may be obtained from such processes is 90% pure (with some water contained therein).
  • a sample may be returned to the column 616 , as needed, in order to properly treat the flows.
  • the “reflux ratio” of a distillation column may be used to determine how much of the sample is removed from the top or bottom of the column 616 compared to how much is sent back into the column 616 .
  • Other ways know to those of skill in the art may be used to operate the column 616 in order to improve the separation of chemicals.
  • the embodiments and techniques disclosed herein may also be used in order to isolate one or more reactants (as needed) from the NaSICON membrane, thereby preventing the reactants from fouling the membrane. It may be desirable to separate reactants and/or products during electrolysis in a NaSICON membrane-containing electrolytic cell because:
  • the separation of the reactant(s) or product(s) from the anolyte may increase the operational current density.
  • embodiments may be constructed in which the particular organic solvent used is specifically selected/tailored to the particular carboxylic acid.
  • the particular organic solvent used is specifically selected/tailored to the particular carboxylic acid.
  • the organic solvent preferentially dissolves the desired product (the lactic acid) and does not dissolve (or perhaps dissolves to a lesser extent) the other organic impurities and/or other carboxylic acids in the anolyte, thereby increasing the purity of the obtained carboxylic acid.
  • the organic solvent preferentially dissolves the desired product (the lactic acid) and does not dissolve (or perhaps dissolves to a lesser extent) the other organic impurities and/or other carboxylic acids in the anolyte, thereby increasing the purity of the obtained carboxylic acid.
  • Those skilled in the art would appreciate how to select these solvents for each particular system/produced carboxylic acid.

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